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Linear Technology Electronic Components Datasheet

LTC2142-12 Datasheet

Low Power Dual ADCs

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FEATURES
n 2-Channel Simultaneously Sampling ADC
n 70.8dB SNR
n 89dB SFDR
n Low Power: 92mW/65mW/48mW Total
46mW/33mW/24mW per Channel
n Single 1.8V Supply
n CMOS, DDR CMOS, or DDR LVDS Outputs
n Selectable Input Ranges: 1VP-P to 2VP-P
n 800MHz Full Power Bandwidth S/H
n Optional Data Output Randomizer
n Optional Clock Duty Cycle Stabilizer
n Shutdown and Nap Modes
n Serial SPI Port for Configuration
n 64-Pin (9mm × 9mm) QFN Package
APPLICATIONS
n Communications
n Cellular Base Stations
n Software Defined Radios
n Portable Medical Imaging
n Multi-Channel Data Acquisition
n Nondestructive Testing
Electrical Specifications Subject to Change
LTC2142-12/
LTC2141-12/LTC2140-12
12-Bit, 65Msps/
40Msps/25Msps Low Power
Dual ADCs
DESCRIPTION
The LTC®2142-12/LTC2141-12/LTC2140-12 are 2-channel
simultaneous sampling 12-bit A/D converters designed
for digitizing high frequency, wide dynamic range signals.
They are perfect for demanding communications applica-
tions with AC performance that includes 70.8dB SNR and
89dB spurious free dynamic range (SFDR). Ultralow jitter
of 0.08psRMS allows undersampling of IF frequencies with
excellent noise performance.
DC specs include ±0.3LSB INL (typ), ±0.1LSB DNL (typ)
and no missing codes over temperature. The transition
noise is 0.3LSBRMS.
The digital outputs can be either full rate CMOS, double
data rate CMOS, or double data rate LVDS. A separate
output power supply allows the CMOS output swing to
range from 1.2V to 1.8V.
The ENC+ and ENCinputs may be driven differentially
or single-ended with a sine wave, PECL, LVDS, TTL, or
CMOS inputs. An optional clock duty cycle stabilizer al-
lows high performance at full speed for a wide range of
clock duty cycles.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
1.8V
VDD
CH 1
ANALOG
INPUT
S/H
12-BIT
ADC CORE
CH 2
ANALOG
INPUT
65MHz
CLOCK
S/H
12-BIT
ADC CORE
CLOCK
CONTROL
GND
1.8V
OVDD
OUTPUT
DRIVERS
D1_11
D1_0
D2_11
D2_0
CMOS
OR
LVDS
OUTPUTS
OGND
21421012 TA01a
2-Tone FFT, fIN = 70MHz and 69MHz
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
10 20
FREQUENCY (MHz)
30
21821012 TA01b
21421012p
1


Linear Technology Electronic Components Datasheet

LTC2142-12 Datasheet

Low Power Dual ADCs

No Preview Available !

LTC2142-12/
LTC2141-12/LTC2140-12
ABSOLUTE MAXIMUM RATINGS (Notes 1, 2)
Supply Voltages (VDD, OVDD)....................... –0.3V to 2V
Analog Input Voltage (AIN+, AIN–,
PAR/SER, SENSE) (Note 3).......... –0.3V to (VDD + 0.2V)
Digital Input Voltage (ENC+, ENC, CS,
SDI, SCK) (Note 4).................................... –0.3V to 3.9V
SDO (Note 4)............................................. –0.3V to 3.9V
Digital Output Voltage ................ –0.3V to (OVDD + 0.3V)
Operating Temperature Range
LTC2142C, LTC2141C, LTC2140C............. 0°C to 70°C
LTC2142I, LTC2141I, LTC2140I ............–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATIONS
FULL RATE CMOS OUTPUT MODE
TOP VIEW
DOUBLE DATA RATE CMOS OUTPUT MODE
TOP VIEW
VDD 1
VCM1 2
GND 3
AIN1+ 4
AIN1– 5
GND 6
48 D1_1
47 D1_0
46 DNC
45 DNC
44 DNC
43 DNC
VDD 1
VCM1 2
GND 3
AIN1+ 4
AIN1– 5
GND 6
48 D1_0_1
47 DNC
46 DNC
45 DNC
44 DNC
43 DNC
REFH 7
42 OVDD
REFH 7
42 OVDD
REFL 8
REFH 9
65
GND
41 OGND
40 CLKOUT+
REFL 8
REFH 9
65
GND
41 OGND
40 CLKOUT+
REFL 10
39 CLKOUT
REFL 10
39 CLKOUT
PAR/SER 11
38 D2_11
PAR/SER 11
38 D2_10_11
AIN2+ 12
AIN2– 13
37 D2_10
36 D2_9
AIN2+ 12
AIN2– 13
37 DNC
36 D2_8_9
GND 14
35 D2_8
GND 14
35 DNC
VCM2 15
VDD 16
34 D2_7
33 D2_6
VCM2 15
VDD 16
34 D2_6_7
33 DNC
UP PACKAGE
64-LEAD (9mm × 9mm) PLASTIC QFN
TJMAX = 150°C, θJA = 29°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
DOUBLE DATA RATE LVDS OUTPUT MODE
UP PACKAGE
64-LEAD (9mm s 9mm) PLASTIC QFN
TJMAX = 150°C, θJA = 29°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
2
21421012p


Part Number LTC2142-12
Description Low Power Dual ADCs
Maker Linear Technology
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